Relay



H. A. EWEN.

RELAY.

APPLICATOH FILED OCT. 19. 1916.

1 ,329,756. miente@ Feb. 3., @2%.

UNITED .STATES PATENT onirica HARRY ALEXANDER EWEN, OF LONDON, ENGLAND, ASSIGNOB, BY MESNE ASSIGN- MENTS, TO RADIO CORPORATION F AMERICA, A CORPORATION 0F DELAWARE.

RELAY.

Application filed October 19, 1916.

Improvements in Relays, of which the folelectric current: j" A lowing is a specification. l

The object of this invention is to provide a relay depending for its action-upon the extension of al-tilamentv'oir filaments due to the heating -produced by the passage of an My invention'is illustrated by thc accompanying drawing. The figure Shows a relay actuated by a pair of filaments.

A is an arm mounted on a Xed pivot B 'so that the only movement of which it is vcapable is rotation in one plane about this pivot. Upon it is adjustably mounted a mass C the weight of which tends t0 keep a contact D u on a terminal E. To the arm isconnected t 1e ends of a pair of conducting filaments F, the other ends of which are connected to a pivoted frame I-I. The filaments are so adjusted that normally, that is, when no current is iiowing through it, their tension holds the arm up so that thecontact D is separated from the terminal E,V but when an electric current iows through the filament and heats it it expands and allows the contact D to come into contact with theterminal E and thus complete an electric circuit between wires K, L connected to the terminal E and to the arm respectively. M is an adjustable stop limiting the upward movement of the contact D. is a sleeve Specification of Letters Yatcnt.

Serial No. 126,521.

Patented Feb. 3, 1920..

insulating the part of the arm connected tol the filament from the tact D.

The pair of iilaments F cross and almost touch, this being the position of greatest sensitiveness. In other words, the frame H has been turned relatively to the arm through an angleof from 150, to 180 from the position in which'the two laments are parallel. The frame H is hinged to a support 0 toward which the frame is drawn for purposes of adjustment by a nut I and a spring P. j

What I claim is:

'1. In a device of the class described in part carrying the concombination, a pivoted arm fixed against arm about its pivot, and means wherebypthe tension of said filaments may be adjusted, said means comprising a hinged frame to which said filaments are connected.4

2. In apdevice of the class described in combination, a pivoted arm iiXed against motion other than rotation, a pair of filaments whose one ends are connected to said arm, a frame to which the other ends of said fila ments are connected,- said frame being hinged on an axis atY one side of and substantially parallel ,to the line joining the points of connection of said filaments with said frame, a fixed support,- a spring connected to said support andsaid frame for ltensioningsaid filaments, and means for ad- .70

justin the tension esaids ring.

gHARRY ALEXAN ER EWEN. 

